| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 0 | 9 | 0.000 | (0,0) | 0.000 | --bye-- |
| 1 | 512 | -0.167 | (0,1) | 0.833 | Iowa St | 7 to 55 | 4 | 38 |
| 2 | 628 | -1.422 | (0,2) | -0.422 | Lamar | 13 to 20 | 415 | 102 |
| 3 | 285 | 0.341 | (1,2) | 0.675 | N Colorado | 24 to 17 | 465 | 224 |
| 4 | 88 | 1.255 | (2,2) | 1.255 | Drake | 42 to 21 | 150 | 144 |
| 5 | 126 | 1.095 | (2,3) | 1.295 | N Dakota St | 13 to 51 | 79 | 34 |
| 6 | 129 | 1.023 | (3,3) | 1.023 | Murray St | 49 to 24 | 355 | 335 |
| 7 | 99 | 1.261 | (4,3) | 1.118 | Indiana St | 19 to 14 | 155 | 150 |
| 8 | 99 | 1.219 | (5,3) | 0.969 | Northern Iowa | 17 to 14 | 215 | 244 |
| 9 | 123 | 1.075 | (5,4) | 0.964 | Illinois St | 13 to 21 | 119 | 113 |
| 10 | 105 | 1.184 | (6,4) | 0.984 | North Dakota | 26 to 21 | 107 | 107 |
| 11 | | | | | S Dakota St | | | 79 |
| 12 | | | | | S Illinois | | | 139 |
| 13 | | | | | --bye-- |
| 14 | | | | | --bye-- |
| 15 | | | | | --bye-- |
| 16 | | | | | --bye-- |
| 17 | | | | | --bye-- |
| 18 | | | | | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |